Cement-pipe mold.



- No. 778,907. .PATENTED JAN. 3, 1905.

L. SHELL.

CEMENT PIPE MOLD.

APPLICATION FILED OCT. 24, 1904.

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ventor,

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\ Witnesses I g by. 7 WWW v a v Attorneys No. 778,907. PATENTED JAN. 8,1905. L. SHELL.

CEMENT PIPE MOLD.

APBIJIGATION FILED 00124, 1904.

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a u v I I v v Httomegs Patented January 3, 190 5.

LEVI SHELL, OF SIBLEY, IOW'A.

CEMENT-PIPE MOLD.

SPECIFICATION forming part of Letters Patent No. 778,907, dated January3, 1905.

Application filed October 24,1904. Serial No. 229,788.

To all whom it may concern:

Be it known that I, LEVI SHELL, a citizen of the United States, residingat Sibley, in the county of Osceola and State of Iowa, have invented anew and useful Improvement in (Jement-Pipe Molds, of which the followingis a specification.

This invention relates to molds for manufacturing cement pipe of varioussizes and forms, and has for its object to improve the construction andexpedite the operation of devices of this character.

With these and other objects in view, which will appear as the nature ofthe invention is better understood, the same consists in certain novelfeatures of construction, as hereinafter fully described and claimed.

In the accompanying drawings, forming a part of thisspecification, andin which corresponding parts are denoted by like designating characters,is illustrated the preferred form of the embodiment of the inventioncapable of carrying the same into practical operation, it beingunderstood that the invention is not necessarily limited thereto, asvarious changes in the shape, proportions, and general assemblage of theparts maybe resorted to without departing from the principle of theinvention or sacrificing any of its advantages.

In the drawings thus employed, Figure 1 is a side elevation of theimproved device. Fig. 2 is a plan view with the cement-guiding meansdetached. Fig. 3 is a vertical section on the line 3 3 of Fig. 2. Fig.4. is an enlarged detail view of one of the jointed expanding andcontracting bars of the inner shell of the improved device.

The improved device comprisesabase member 10, having an annular rib 11,conforming to the thickness of the pipe to be molded.

The body of the mold comprises an outer shell or casing 12 and an innercasing or shell 13, each formed of a single metal plate of suitablethickness andresiliency and overlapping, respectively, at one side. Theouter casing or shell 12 is provided near its overlapping end 14 with avertical shaft 15, mounted for rotation thereon, as by clips 16 17, saidshaft being provided with spaced cranks 18 19, the latter beingpivotally connected to the underlapping end 20 of the outer shell byrods 21 22 shaft 33 and clip members 30 31.

and the shaft provided with an operatinghandle 23. By this arrangementit will be obvious that when the handle is moved to the position shownin Figs. 1 and 2 the outer shell 12 will be contracted and compressedtightly around the rim 11 of the base and form the outer wall of themold, and when the position of the shaft is reversed by throwing thehandle member to the opposite position the resilient member 12 will beexpanded, so that it can be readily lifted from the molded pipe, ashereinafter more fully described.

Attached rigidly to the inner shell 13 are spaced'brackets 24: 25, inwhich is mounted a fixed vertical shaft provided with terminal studs 2627, the latter being disposed substantially central of the inner shell,as shown. Rotatively connected by one end to these studs are rods 28 29,the opposite ends of which are pivotally connected, as by clips 30 31,to the inner shell near its inner lapping end 32.

Supported for rotation within the outer shell, preferably in thebrackets 2 25, is a shaft 33, having jointed bars 34 35 connectedrigidly by one end .thereto and with other ends of the bars connectedrotatively to the inner lapping end 32, preferably to the same clips 3031 to which the rods 28 29 are coupled. The joints 36 37 of the bars 34:35 are formed with stops, one of which is shown at 38 in Fig. 4, whichrepresents one of the bars disconnected and enlarged to limit themovement in one direction and to prevent the bars being moved beyond adirect line between the The shaft 33 is provided with anoperating-handle 39. By this means it will be obvious that when theshaft 33 is rotated in one direction the jointed bars 34: 35 will bestraightened out or positioned as in Figs. 2 and 3, with the effect ofexpanding the inner shell and pressing it closely against the inner faceof the rim 11 and forming the inner wall of the mold as the outer shellforms the outer wall of the same. Then when the shaft 33 is rotated inthe opposite direction the jointed bars will be buckled or foldedtogether and contract the inner shell to loosen it and enable it to bewithdrawn from the molded pipe.

Attached at suitable intervals to the outer shell 12 and spaced belowits top are radiallying within the inner shell and supporting thefunnel-shaped member from lateral movement. These members 41 42, it willbe obvious, form the means for guiding the material for forming thepipeinto the mold. The material employed may be any of the compounds usuallyemployed for sewer-pipes and for similar purposes, and the molds may beof any size or of any of the usual forms. After the shells 12 13 areclamped in position upon the base member 10 11 the members 41 42 arepositioned thereon and the material fed into the mold and tamped thereinwith any of the usual implements, and after setting for the requisitetime the members 41 42 are removed and the outer and inner shellsloosened and removed, leaving the molded pipe standing upon the base 1011, from whence it may be removed when sufficiently hardened, the upperedge of the molded pipe being smoothed off with a trowel or otherimplement before the shells 12 13 are removed.

The members 12 13 may be of any desired thickness, but in practice No.14 lightboiler or tank steel has generally been employed.

The length of time necessary for the molded pipe sections to set dependsupon the composition of which they are made, and in some forms the moldsmay be detached immediately after the tamping is completed, while withother compositions a longer time will be required.

Having thus described the invention, what is claimed is 1. In a mold formanufacturing cement pipe, a split outer shell having overlappingterminals, means for expanding and contracting said shell, an innershell spaced from the outer shell and also provided with overlappingterminals, brackets rigidly secured to the interior walls of the innershell, studs carried by the brackets, rods forming a pivotal connectionbetween said studs and the inner lapping end of the inner shell, jointedbars connecting the inner lapping and outer lapping portions of saidinner shell, and means for moving said bars laterally to thereby causethe expansion and contraction of the inner shell.

2. In a mold for manufacturing cement pipe, a base provided with anannular stoprib, a split outer shell seated on the base and havingoverlapping terminals, an inner shell spaced from the outer shell andalso provided with overlapping terminals, brackets rigidly secured tothe interior walls of the inner shell, studs carried by the brackets,rods forming a pivotal connection between said studs and the innerlapping end of the inner shell, jointed bars connecting the innerlapping and outer lapping portions of said inner shell, means for movingsaid bars laterally to thereby cause the expansion and contraction ofsaid inner shell, a crank-shaft mounted for rotation on one terminal ofthe outer shell, a pivotal connection between said crank-shaft and theop posite terminal of the outer shell, and means for rotating said shaftto draw the outer shell into engagement with the stop-rib of said base.

3. In a mold for manufacturing cement pipe, a split outer shell havingoverlapping terminals, means for expanding and contracting said shell,an inner shell spaced from the outer shell and also provided withoverlapping terminals, brackets rigidly secured to the interior walls ofthe inner shell, studs carried by said brackets, rods forming a pivotalconnection between said studs and the inner lapping end of said innershell, a shaft mounted for rotation upon the outer lapping portion ofthe inner shell, and jointed bars connecting said shaft and the innerlapping portion of said inner shell.

4. In a mold for manufacturing cement pipe, a split outer shell havingoverlapping terminals, means for expanding and contracting said shell,an inner shell spaced from the outer shell and also provided withoverlapping terminals, brackets rigidly secured to the interior walls ofthe inner shell, studs carried by said brackets, rods forming a pivotalconnection between the studs and the inner lapping end of the innershell, a shaft mounted for rotation upon the outer lapping portion ofthe inner shell, jointed bars connecting said shaft and the interlappingportion of said inner shell, and each provided with a stop for limitingits movement in one direction, and means for rotating said shaft tothereby cause the jointed bars to expand and contract said inner shell.

5. In a mold for manufacturing .cement pipe, a split outer shell havingoverlapping terminals, means for expanding and contracting said shell,an inner shell spaced from the outer shell and also provided withoverlapping terminals, brackets rigidly secured to the interior walls ofthe inner shell, vertically-disposed studs carried by said brackets,rods forming a pivotal connection between said studs and the innerlapping end of the inner shell, a shaft mounted for rotation in saidbrackets, jointed bars connecting said studs and inner lapping portionof said inner shell, stops for limiting the outward movement of thejointed bars, and means for rotating said shaft.

In testimony that I claim the foregoing as my ownI have hereto aflixedmy signature in the presence of two witnesses.

LEVI SHELL.

Witnesses:

ALFRED MORTON, H. U. BECKMAN.

